Finding the Fourth Proportional to 1,435.42, 1,980.79 and 806.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.42 : 1,980.79 = 806.05 : x
2. Step 2: Convert to fraction form
   1,435.42/1,980.79 = 806.05/x
3. Step 3: Cross multiply
   1,435.42x = 1,980.79 × 806.05
4. Step 4: Simplify right side
   1,435.42x = 1,596,615.78
5. Step 5: Solve for x
   x = 1,596,615.78/1,435.42
6. Step 6: Final answer
   x = 1,112.30